The club run by Ian and Lorna Campbell in Birmingham was The Jug of Punch. This is where Paul Simon picked up "The Sun is Burning". It may or may not be earlier than MacColl's club in London.

I just learned of another Campbell - MacColl comparison. Ian Campbell recorded two "Radio Ballads" for the BBC in the format invented by MacColl, Peggy Seeger and Parker. He wrote about these in 1999 here:
http://www.mustrad.org.uk/enth13.htm